Printable Hard Sudoku

Set 3jvdk. 8 puzzles with an answer key, ready to print.

Hard puzzles start with about 29 givens and need real techniques: pointing pairs, naked pairs and hidden pairs. Paper is a great way to practice them, because you have to keep your own notes honest.

Each free PDF has 8 puzzles, four to a page on US Letter paper, plus an answer key with every solution. Every puzzle has exactly one solution. A new set appears here every day, or you can grab a different set any time.

Puzzles in this set

Hard #1
9 5 2 3
7
6 3 8
4 2 6 8 1
1 2 9 6
5 7 4
2 9 4 5 8
8 2
1 2
Hard #2
6 7 3
4 1 5
2 9 8
3 2 7
2 8 9
3 4 2 8
5 6 1
4 3 1 8 9
8 7
Hard #3
5 8 4 3
3 5 6
4 6 9 1
7 6 1
9 4 5 3
4 9
7 3 2 4
5 3
2 6 8
Hard #4
9 3 8
4
3 5 1
9 7 4 2
9
6 1 4 5 3
4 1 5 9 2
2 3 9 5
7 6 4
Hard #5
9 5
4 3 7
3 7 9 6
1 5 9
1 8 2 4
4 3 6 5 1
3 1
8 5
2 5 3 8
Hard #6
4 7 5
7 3
3 8 1 2
1 2 5
3 4 8 7 1
2 1 3
9 6 4 2
9 5 8 2
6
Hard #7
1 8 6 5
9 7
8 4 5 2
1 3 5 4
6 4 7 9 2
4 6 8
5 8
2 4 3
9 6
Hard #8
6 4
5 1 8 9
8 2 1 3 4
2 1
1 7 5 8
8 2 4 7
7 8 6 3
5 9
6 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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